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<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<div class="block1"></div>
  <div class="block1">1</div>
  <div class="block1 block2">2</div>
  <div class="block1 ">3</div>
  <div class="block1">4</div>
 <div class="block-hid">button</div>
</body>
</html>
 
$(window).scroll(function () {
    if ($(window).scrollTop() >= $('.block2').offset().top + $('.block2').height()) {
        $('.block-hid').addClass("block-hid--visible");
        $('.block-hid').stop().animate({
            bottom: "0px"
        }, 900);
    };
    
                                   
    if ($(window).scrollTop() < 250 && $('.block-hid').hasClass("block-hid--visible")) {
        $('.block-hid').removeClass("block-hid--visible");
        $('.block-hid').stop().animate({
            bottom: "-100px"
        }, 1000);
    };
});
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anonymouspro
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